如何使用 Room Relation 获取另一个 pojo 的列表

Question

@Entity(tableName = "subscription")
data class Subscription(
    @PrimaryKey val planId: Int,
    @ColumnInfo(name = "plan_name") val planName: String? = null,
    @ColumnInfo(name = "plan_description") val planDescription: String? = null,
    @ColumnInfo(name = "plan_reg_fee") val planRegFee: String? = null,
    @ColumnInfo(name = "plan_monthly_charge") val planMonthlyCharge: String? = null
)


data class Benefit(
    @ColumnInfo(name = "benefit_id") val benefitId: Int? = null,
    @ColumnInfo(name = "benefit_code") val benefitCode: Int? = null,
    @ColumnInfo(name = "benefit_name") val benefitName: String? = null,
    @ColumnInfo(name = "benefit_status") val benefitStatus: String? = null
)

如何获取订阅中的福利列表，即，

val benefitList: LiveData<List<Benefit>>? = null

使用房间关系

Answer 1

您可以从Google Documents 中找到示例。 有一些关于房间关系的例子。